Today, lightdm-gtk-greeter fail too. I was setting the gtk greeter and decided to remove the session indicator. And after that, the problems started again. I removed the ubuntu-desktop package, leaving only Mate Desktop but the "error on logon" message continued. I decided to return the session indicator and the problem disappeared.
The indicator provides no role for me and my users because only MATE is installed now, and I set this in /etc/skel for default. But serves to mark a desktop to start, option that has no effect on the working environment but avoid the session error. Sorry for my english -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1312526 Title: lightdm fails to start session unless user selects session To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1312526/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs